Freedom's Prophet: Soulguard, Book 5 (Unabridged‪)‬

The last thing Rictor Hughes expected when he chose to give his life in Kansas to save others was to wake up. Even more surprising was to find himself on the other side of the exploding gateway in a facility under the care of an Artificial Intelligence with psychological issues. The world outside is inhabited by millions of the Kresh and millions of humans under their control. 

What is a Marine, turned Soulguard to do? Start a revolution, of course....